117 DK, just did 2 islands.Won 1, lost one. 71400 bonus XP. With rested bonus, pushed 550k XP/hr.
Apparently Island Experience change went live earlier, because it's same exp as what I've been getting yesterday - roughly 10% of level for completion, and roughly 10-5% from kills (rested/not). On top of that, you get chance for quest item, and possibility of 310 gear (sure, transmog, but it still boosts ilvl for better WQ rewards if you could equip it), and good start in HoA levels. Unless you want reputation from doing quests on that alt, Island Expeditions are currently THE way to level.
Another, as far as I can tell undocumented, change to leveling, random treasure chests now do give experience for opening them, half of average quest experience
you know pets are account wide, so the achievement doesn't have to be
No ability to queue for islands as low as 110. There's some requirements needed which is higher than 110.... even for alts.
That's been true since WoD, hidden chests in the world award 15-20 standard mob kills worth of XP.